ABB 1SVR730841R1400 CM-SRS Protection Relay 21S SD

ABB 1SVR730841R1400 CM-SRS.21S is a DIN-rail mounted, single‑phase current monitoring relay designed to guard AC mains by sensing current in the monitored conductor and signaling when that current deviates from a defined range. The unit operates from 220–240 VAC and monitors the line current on the conductor between B and C in a 3 mA to 1 A RMS range, offering two changeover outputs (DPDT) for signaling and interlock functions in control circuits. As part of ABB’s CM-SRS family, this 1SVR730841R1400 variant provides dual signaling paths for monitoring and protection in power‑distribution panels and motor‑control applications where precise current monitoring and clear signaling are required. The CM-SRS.21S designation and 2c/o outputs indicate its role as a dual-output current monitoring relay for single‑phase mains across typical industrial voltages.